161456636 has 12 divisors (see below), whose sum is σ = 308235480. Its totient is φ = 73389360.

The previous prime is 161456629. The next prime is 161456677. The reversal of 161456636 is 636654161.

It is a self number, because there is not a number n which added to its sum of digits gives 161456636.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1834691 + ... + 1834778.

It is an arithmetic number, because the mean of its divisors is an integer number (25686290).

Almost surely, 2^161456636 is an apocalyptic number.

It is an amenable number.

161456636 is a deficient number, since it is larger than the sum of its proper divisors (146778844).

161456636 is a wasteful number, since it uses less digits than its factorization.

161456636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3669484 (or 3669482 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 161456636 is about 12706.5587788354. The cubic root of 161456636 is about 544.5260149644.

The spelling of 161456636 in words is "one hundred sixty-one million, four hundred fifty-six thousand, six hundred thirty-six".